Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c312cd4d99a1ed…

MALICIOUS

PDF

98.5 KB Created: 2021-07-02 15:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c47d8ea2683b698e86ec904d74c142e9 SHA-1: 48bad053392886e394c649ac2b9cdb779bd7480d SHA-256: 03c312cd4d99a1edbe0bea5391ba90a79abf7069d061455d9896d43b773285b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jrpst.pl/userfiles/file/fukifabagodoxebonamiz.pdf In PDF document text
    • https://fl-forever.com/upfiles/editor/files/putiropodagedijen.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f5fb5287---tezipovegefobutixalosefik.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/iuhb9ohiag2s4s9j1c55adv8gt/gijemuxarajinixejirexel.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7ca524d3---lujebupizesurulebewadevaj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e680de4b824f8e53802e0e6485c78011/23630601863.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a809baa449e---gowopuderakakiwiw.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sepadexiduwolawezup.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e5b9b76c---melonununujali.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/gabeposoterolifugit.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/sorizusoxekijaxojar.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/wamurejo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/24b56312e74f69a8327ab060e7d3c566/fanukiwijoterubiseroretep.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/ragezoj.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/roxuverolelevibinir.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ecc3190d9---bogikozerakuf.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa7730ff7---55827315355.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/547f00de02a6e6b610834c22edc6a774/18259266744.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a578d544---potuzused.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc522cfa1---zelewaguvajoxaj.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e38f9e7bdffaf072fa17a8163f2a06d7/fafem.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/75567853290.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4a08892---dufolafaduse.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/porarakusoborumudisel.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160883fed356d5---petoropopepuzarun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=academy+of+nutrition+and+dietetics+complete+food+and+nutrition+guide+5th+ed+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 18472 bytes
SHA-256: 90be20eb7365a9e667a4f7203177598294c13a7bab6cdad6abe6974e00e6edae
font_01_sfnt_off00014922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16139 11396 bytes
SHA-256: 83444ad203b8e4aa6faec72f766acd0ef11a86edab58b92a7ba8c46bf7a3789d